31 Grist Mill Rd
31 Grist Mill Rd (EPA ID CT0419221) in OLD Lyme, CT supplies groundwater (wells) to about 30 people: 6 violations since 2016, latest lead result 0 ppb, PFAS not tested.
Health-based violations since 2016: Revised Total Coliform Rule, Groundwater Rule, Lead and Copper Rule Revisions. 3 are still listed as unresolved in EPA records.
90th-percentile lead in the latest round (Jan 2026). Lead comes mostly from household plumbing and service lines, so individual homes can be higher.
This system was not part of EPA’s 2023–2025 nationwide PFAS testing (UCMR 5 covers systems serving over 3,300 people and a sample of smaller ones).
System facts
Health-based violations
| Contaminant or rule | Health-based violations since 2016 |
|---|---|
| Revised Total Coliform Rule | 4 |
| Groundwater Rule | 1 |
| Lead and Copper Rule Revisions | 1 |
A health-based violation means a contaminant exceeded its legal limit (MCL) or a required treatment technique was not met, as reported by the state to EPA’s SDWIS. 3 still listed as unresolved (“unaddressed” or “addressed” but not yet returned to compliance); the latest began Oct 2024.
Lead
90th-percentile lead per sampling round (90% of the homes sampled were at or below this level). Black line: EPA’s 15 ppb action level; under the Lead and Copper Rule Improvements the action level becomes 10 ppb from 2027.
PFAS
This system was not part of EPA’s 2023–2025 nationwide PFAS testing (UCMR 5).
What this is — and isn’t. These are records your water utility and state reported to the EPA, and the EPA’s radon map for your county. They describe the system and the area, not the water from your own tap or the air in your home. For that, read your utility’s annual Consumer Confidence Report and test: lead and radon tests are inexpensive.
Questions
Has 31 Grist Mill Rd had drinking water violations?
Health-based violations since 2016: Revised Total Coliform Rule, Groundwater Rule, Lead and Copper Rule Revisions. 3 are still listed as unresolved in EPA records.
What is the lead level in 31 Grist Mill Rd water?
The latest 90th-percentile lead result (Jan 2026) was 0 ppb. EPA’s action level is 15 ppb (10 ppb from 2027).
Does 31 Grist Mill Rd have PFAS in its water?
This system was not part of EPA’s 2023–2025 nationwide PFAS testing (UCMR 5 covers systems serving over 3,300 people and a sample of smaller ones).